Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue Streams of Rental Income and Percentage of Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amount of rental income	$ 639,620	$ 612,299	$ 1,272,451	$ 1,216,219
Percentage of rental income	100.00%		100.00%
Amount of rental income	$ 599,976		$ 1,192,789
Leasing Revenue [Member}
Percentage of rental income	93.80%		93.80%
Utility Recoveries [Member]
Amount of rental income	$ 15,560		$ 30,935
Percentage of rental income	2.40%		2.40%
Parking Revenue [Member]
Amount of rental income	$ 6,267		$ 14,064
Percentage of rental income	1.00%		1.10%
Other Revenue [Member]
Amount of rental income	$ 17,817		$ 34,663
Percentage of rental income	2.80%		2.70%